JPH0374697A - Method for repairing feed pipe for gas conduit - Google Patents

Abstract

PURPOSE:To perform a rapid repair work by a method wherein a jig for preventing leakage of gas is mounted to a method cock, a bypass pipe is connected to a bypass pipe connection tool, a jig for preventing leakage of gas is mounted to a valve tee, and after the feed of gas is stopped and a feed pipe is connected, gas is fed, the bypass pipe is closed, and the jigs for preventing leakage of gas are recovered. CONSTITUTION:In a method wherein a feed pipe 1 is repaired between a valve tee 3 on the branch pipe 2 side and a meter cock 5, a jig 6 for preventing leakage of gas is mounted to the meter cock 5, and bypass pipe 8 is connected to a bypass pipe connection tool 10. A jig 11 for preventing leakage of gas is mounted to the valve tee 3, the bypass pipe connection tool 10 is engaged with a tee body 3a, the feed of gas is stopped, and the jigs 11 and 6 for preventing leakage of gas are recovered. As a result, a rapid repair work can be executed without suspending the feed of gas and besides without leakage of gas.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for repairing a supply pipe of a city gas pipeline, in which the supply pipe is repaired between a valve tee and a meter cock on the main or branch side.

[Conventional technology]

Conventionally, in order to reduce the inconvenience to customers, in order to supply city gas to customers during repair of a supply pipe, first, as shown in Figure 5, the main branch pipe was connected to the main branch using a suitable non-stop branching method, as shown in Figure 5. The bypass pipe (23) is connected to the branch joint (22) attached to (2).
), then connect the inner plug (3C) at the valve tee (3) and cut off the city gas supply from the main branch pipe (2) to the supply pipe (1), then connect the gas meter (4) and the meter cock ( 5), connect the air-purged bypass pipe (23) to the gas meter (4), and open the cock (24) to connect the bypass pipe (23) to the gas meter (4).
3), city gas was supplied to demand customers.

[Problem to be solved by the invention]

However, the uninterrupted flow branching method generally requires quite complicated procedures, making it troublesome and time-consuming to construct.In addition, the bypass pipe (23
) is troublesome and time-consuming, and furthermore, the work of closing the hole in the main branch pipe (2) and recovering the branch joint (22) and the bypass pipe (23) is also troublesome and time-consuming. Overall, the construction required a great deal of effort and time, and there was room for improvement in terms of workability and efficiency.

In addition, during the period from when the city gas supply is cut off by the inner plug (3c) at the valve chi (3) until the city gas supply is restarted through the bypass pipe (23), and when the supply pipe (1)
When reconnecting to the customer, the bypass pipe (23) is removed from the gas meter (4), the supply pipe (1) is connected to the gas meter (4), and the inner plug (3c) is opened. The city gas supply had to be interrupted for a long time, which still caused inconvenience to customers, and there was room for improvement in terms of service.

It is an object of the first and second inventions to repair the supply pipe while supplying city gas to the consumer through the bypass pipe, without any interruption in the city gas supply, and moreover, to repair the supply pipe while supplying city gas to the consumer through the bypass pipe. The point is that it can be executed quickly without any omissions.

An object of the third invention is to provide a bypass pipe connector convenient for carrying out the construction methods of the first and second inventions.

[Means to solve the problem]

A characteristic feature of the first invention is that, when repairing the supply pipe between the valve tee and the meter cock, a gas leak prevention jig is attached to the meter cock, and the meter cock is fixed while the gas leakage is prevented by the jig. After removing the cock closure from the cock body, fitting a repair closure to the cock body and communicating the meter cock outlet with the meter cock inlet through the internal flow path of the repair closure,
The bypass pipe connected to the internal flow path of the repair closure is air-purged with city gas from the supply pipe and connected to the bypass pipe connector, a gas leak prevention jig is attached to the valve tee, and the repair is performed. After removing the plug of the valve chi from the chi body while preventing gas leakage with the fitting, the bypass pipe connector is fitted onto the chi body, and the city gas supply to the supply pipe is connected to the bypass pipe connector. At the same time, supply city gas to the meter cock outlet through the bypass pipe, cut off the city gas supply from the bypass pipe to the meter cock inlet by rotating the repair closure, While continuing the supply of city gas to the demand destination, the supply pipe is repaired and reconnected, and after the repair, the supply pipe is air-aired with the city gas supplied from the bypass pipe by rotating the repair closure. purge, pull out the bypass pipe connector, connect the cock inlet, cock outlet, and bypass pipe by rotating the repair closure, supply city gas to the supply pipe, and close the bypass pipe. Then, with the gas leakage prevention jig blocking gas leakage, the bypass pipe connector is removed from the chie body, the plug is attached to the chie body, and the gas leakage prevention jig is attached to the valve chie. , remove the repair closure from the cock body while preventing gas leakage with the gas leak prevention jig, and attach the closure to the cock body in an open state;
The purpose of the present invention is to recover the gas leak prevention jig from the meter cock, and its function is as follows.

[For production]

Make effective use of the valve chi and meter cock that are originally provided, remove the closure at the meter cock and install a repair closure, connect the bypass pipe to the repair closure,
At the same time, by removing the plug at the valve tee and fitting the bypass pipe connector, a bypass pipe is temporarily installed across the valve tee and the meter cock by connecting the bypass pipe to the bypass pipe connector, and the bypass pipe is used to connect the supply pipe. Even during repairs, city gas can be supplied on demand, reducing inconvenience to customers.

In addition, when installing the repair closure, we use a gas leak prevention jig to suppress gas leakage from the meter cock, and also connect the meter cock outlet to the meter cock inlet through the internal flow path of the repair closure, and connect the supply pipe to the meter cock outlet. This allows continuous supply of city gas to demand customers.

In addition, when installing the bypass pipe connector, we use a gas leak prevention jig to suppress gas leakage from the valve chi, and at the same time cut off the city gas supply to the supply pipe, and connect the meter cock outlet with a bypass pipe that has been air purged in advance. It is possible to supply city gas and continuously supply city gas to customers who demand it.

In addition, when removing the bypass pipe connector, connect the cock outlet to the cock inlet using a repair closure, and supply city gas to the supply pipe that has been air purged in advance. With the prevention jig suppressing gas leakage from the valve, the bypass pipe connector can be removed and a plug installed to continue supplying city gas to customers.

In addition, when removing the repair closure, use a gas leak prevention jig to prevent gas leakage from the meter cock.
By removing the repair closure and installing the closure in the open position, city gas can be continued to be supplied to customers through the supply pipe.

In short, it is possible to completely eliminate interruptions in the city gas supply due to supply pipe repairs, completely eliminate any inconvenience to customers, and moreover, construction can be carried out with almost no gas leakage.

Furthermore, the work of attaching a repair closure to the meter cock in place of the closure can be carried out more easily and quickly than by disassembling the supply pipe and connecting the bypass pipe as in the prior art described above.

In addition, the work of connecting the bypass pipe to the main valve pipe using a bypass pipe connector requires more steps and takes more time than connecting the bypass pipe to the main pipe using the non-flow branching method as in the prior art described above. It can be done with significantly less.

Furthermore, after repairs, it is sufficient to install a closure instead of the repair closure at the meter cock, and a plug instead of the bypass pipe connector at the valve chi. Therefore, the bypass pipe can be recovered and reused. Restoration work for supplying city gas through a supply pipe requires fewer steps and more time than the prior art described above, which involves closing the main branch pipe opening, recovering the branch joint or bypass pipe, and then restoring and connecting the supply pipe. This can be done with significantly less effort.

In short, the supply pipe between the valve tee and the meter cock can be repaired very easily and quickly.

[Means to solve the problem]

A characteristic feature of the second invention is that when repairing the supply pipe between the valve cheek and the meter cock, a gas leak prevention jig is attached to the valve cheek, and the gas leakage is prevented by the jig, and the valve cheek is fixed. After removing the plug from the chi body, fit a bypass pipe connector into the chi body, cover the plug hole of the chi body with the bypass pipe connector, and connect the bypass pipe connected to the bypass pipe connector. Purge the air with city gas from the valve Q and connect it to a repair shutoff, attach a gas leak prevention jig to the meter cock, and with the jig preventing gas leakage, close the meter cock. is removed from the cock body, and then the repair closure is fitted onto the cock body, and the bypass pipe is connected to the meter cock inlet and meter cock outlet through the internal flow path of the repair closure, and the bypass pipe is connected to the meter cock inlet and outlet. Inserting a pipe connector into the chi body and cutting off city gas supply to the supply pipe by the action of the bypass pipe connector, simultaneously supplying city gas to the meter cock outlet through the bypass pipe, and repairing the pipe. Cutting off the city gas supply from the bypass pipe to the meter cock inlet by rotating the utility shutoff, repairing and restoring the supply pipe while continuing the city gas supply to the demand destination through the bypass pipe, After the repair, the supply pipe is air-purged with city gas supplied from the bypass pipe by rotating the repair closure, and the bypass pipe connector is pulled out, and the cock inlet is closed by rotating the repair closure. , the cock outlet, and the bypass pipe are communicated with each other to supply city gas to the supply pipe, and with the bypass pipe closed and gas leakage prevented by the gas leak prevention jig, the bypass pipe connector is connected. The plug is removed from the valve body, the plug is attached to the valve body, the gas leak prevention jig is recovered from the valve body, and the repair valve is removed with the gas leak prevention jig blocking gas leakage. removing the lock from the cock body and attaching the shutter to the cock body in an open state;
The purpose of the present invention is to recover the gas leak prevention jig from the meter cock, and its function is as follows.

[For production]

Similar to the first invention, by effectively utilizing the originally provided valve tee and meter cock, city gas is delivered to the demand site during supply pipe repair by temporarily constructing a bypass pipe using a repair closure and a bypass pipe connector. Can be supplied.

In addition, when installing the bypass pipe connector, we use a gas leak prevention jig to suppress gas leakage from the valve chi.
The supply pipes allow continuous supply of city gas to demand customers.

In addition, when installing the repair closure, we use a gas leak prevention jig to suppress gas leakage from the meter cock, and also connect the meter cock outlet to the meter cock inlet through the internal flow path of the repair closure, and connect the supply pipe to the meter cock outlet. This allows continuous supply of city gas to demand customers.

Further, when inserting the bypass pipe connector, the gas supply to the supply pipe is cut off, and at the same time, city gas is supplied to the meter cock outlet through the air-purged bypass pipe, so that city gas can be continuously supplied to the demand destination.

Moreover, since the bypass pipe connector and the repair closure are removed using the same method as in the first invention, it is possible to continue supplying city gas to the consumer for the same reason, and gas leakage can be sufficiently suppressed.

In short, similarly to the first invention, there is no interruption in city gas supply due to supply pipe repair, there is no inconvenience to customers, and the work can be carried out with almost no gas leakage.

Furthermore, since the connection and separation of the bypass pipe between the valve tee and the meter cock is almost the same method as in the first invention, the repair of the supply pipe between the valve tee and the meter cock is extremely easy for the same reason as the first invention. Easy and quick to implement.

[Means to solve the problem]

The characteristic configuration of the bypass pipe connection according to the third aspect of the present invention is that one of the pair of connecting members of the quick joint that is connected to each other and has a cutoff valve has a threaded portion that can be freely screwed into the inner plug mounting threaded portion of the valve Q. The reason is that it is attached to the plug part in a penetrating state, and its function is as follows.

[For production]

By providing the above-mentioned bypass pipe connector in place of the inner valve in advance at the valve Q, when connecting and disconnecting the bypass pipe from the valve Q, the other connecting member of the quick fitting attached to the bypass pipe can be simply bypassed. It is sufficient to simply insert or pull out a connecting member with a cutoff valve of a pipe connector, and the work can be easily and quickly performed without requiring a gas leakage prevention jig and without gas leakage.

〔Effect of the invention〕

As a result, it is possible to completely eliminate any inconvenience to customers due to interruptions in the city gas supply, to fully prevent problems caused by gas leaks, and to supply superior city gas pipelines that are extremely advantageous in terms of work efficiency and ease of construction. We were able to establish a pipe repair method.

In addition, it has become possible to provide a convenient bypass pipe connector that is more advantageous in terms of work efficiency and workability when implementing the construction method.

〔Example〕

Next, examples will be shown.

[A] Example 1 (1) In a city gas pipeline, as shown in Figure 1 (a), the supply pipe (1) to be repaired is connected to the main or branch pipe (2).
Dig out the valve chi (3) that connects to.

(2) As shown in Figure 1 (0), at the meter cock (5) installed on the ground near the upstream side of the gas meter (4), attach a transparent bag-shaped gas leak prevention jig (4) to the cock body. (
3a), and the working opening (4) is formed in the jig (4) so as to be automatically closed by the restoring action of the elastic material (4a).
Insert your hand into the jig (4) from b) and tighten the meter cock (5).
) after removing the closure (5b) from the cock body (5a), fit the repair closure (7) onto the cock body (5a),
As shown in Figure 2 (a), the meter cock outlet (5d) is communicated with the meter cock inlet (5c) through the internal flow path (7a) of the repair closure (7), and city gas is supplied to the consumer. Continue.

Then, connect the bypass pipe (8) to the repair closure (7), and connect the bypass pipe (8) to the meter cock inlet (5c) and meter cock outlet (5d) as shown in Figure 2 (a). let At this time, the cock (9) provided at the other end of the bypass pipe (8) is fully closed.

(3) Open the cock (9), purge the bypass pipe (8) with city gas from the supply pipe (1), and connect the bypass pipe (8) to the bypass pipe connector (10).

(4) As shown in Figure 1 (c), in the valve chi, attach a transparent bag-shaped gas leak prevention jig (11) to the valve chi body (
3a), and the elastic material (lla) is attached to the jig (11).
Insert your hand into the jig (11) through the working opening, which is formed to be automatically closed by the restoring action of the outer plug (3).
b) and inner plug (3c), and remove the Qi body (3c).
Fit the bypass pipe connector (10) to the supply pipe (1).
) is cut off by the action of the bypass pipe connector (10), and at the same time, city gas is supplied to the meter cock outlet (5d) through the bypass pipe (8) with the cock (9) open.

(5) Immediately thereafter, by rotating the repair closure (7), as shown in Figure 2 (b), cut off the city gas supply from the bypass pipe (8) to the meter cock population (5c);
City gas leakage due to flow from the supply pipe (1) to the chi main body (3a) is suppressed.

(6) Repair and restore the supply pipe (1) while continuing to supply city gas to the consumer through the bypass pipe (8).

(7) By rotating the repair closure (7), the
As shown in b), the supply pipe (1) is air-purged with city gas supplied from the bypass pipe (8).

(8) As shown in Figure 1 (2), the bypass pipe connector (
10) to communicate the valve tee (3d) and the valve tee outlet (3e), and as shown in Fig. 2(a), by rotating the repair closure (7), the cock inlet (5C) and the cock The outlet (5d) and the bypass pipe (8) are connected to supply city gas to the supply pipe (1).

(9) With the cock (9) of the bypass pipe (8) fully closed and gas leakage prevented by the gas leak prevention jig (11), remove the bypass pipe connector (10) from the chi body (3a). Removal, inner and outer plug (3b), (
3c) is attached to the chi body (3a), and the gas leak prevention jig (11) is recovered from the pulp chi (3).

0 ■ With gas leakage prevented by the gas leak prevention jig (6), remove the repair closure (7) from the cock body (5a), and with the closure (5b) open, open the cock body (5a).
Attach the gas leak prevention jig (6) to the meter cock (
5) Collect from.

01) Backfill with Barbecue (3) and complete the construction.

[B Example 2 (1) In the same manner as in Section 1 of Example 1, pulp tea (3) is dug out.

(2) As shown in Figure 3 (a), in the valve chi (3), attach a transparent gas leak prevention jig (12) to the chi body (3a), and attach an elastic material to the jig (12). (12
Insert your hand into the jig (12) through the working opening formed to be automatically closed by the restoring action in a), remove the outer plug (3b) and inner plug (3c), and insert it into the jig body (3a). The bypass pipe connector (13) is fitted and the plug hole of the chi body (3a) is covered with the bypass pipe connector (13).

Then, connect the bypass pipe (14) to the bypass pipe connector (13).
) to connect. At this time, the cock (15) provided at the other end of the bypass pipe (14) is fully closed.

(3) Open the cock (15), purge the bypass pipe (14) with city gas from the valve Qi (3), and connect the bypass pipe (14) to the repair closure (16).

(4) As shown in Figure 3, at the meter cock (5) installed on the ground near the upstream side of the gas meter (4),
Place the transparent bag-shaped gas leak prevention jig (17) on the cock body (
5a), and the elastic material (17a) is attached to the jig (17).
Insert your hand into the jig (17) through the working opening, which is formed so that it is automatically closed by the restoring action of the meter cock (5).
After removing the closure (5b) from the cock body (5a),
The repair closure (16) is fitted onto the cock body (5a), and as shown in Fig. 2 (a), the bypass pipe (14) and The meter cock inlet (5c) and the meter cock outlet (5d) are communicated,
Continue supplying city gas to demand customers.

(5) Open the cock (15) of the bypass pipe (14), insert the bypass pipe connector (13), and cut off the city gas supply to the supply pipe (1) by the action of the bypass pipe connector (13). At the same time, the meter cock outlet (
5d)).Supply city gas to 5d) (see Figure 1(c)).

(6) Immediately thereafter, as in item (5) of Example 1, cut off the city gas supply from the bypass pipe (14) to the meter cock inlet (5c) by rotating the repair closure (16).

(7) Repair and restoration connection of supply pipe (1) and supply pipe (1
) air purge, restarting the city gas supply via the supply pipe (1), removing the bypass pipe connector (13) and repair closure (16), and removing the inner plug (3c) and outer plug (3c).
b) and the closure (5b), gas leak prevention jig (1)
2), perform recovery of (17) and backfilling of pulp tea (3).

[Another example]

Next, another example will be shown.

Gas leak prevention jig (6), (11), (12),
The specific structures of (17) and the repair closure (7) and <16) can be changed as appropriate.

The specific structure of the bypass pipe connectors (10) and (13) can also be changed as appropriate. For example, as shown in Figure 4 (a),
The bypass pipes (8) and (14) may be passed through a rubber stopper (19) provided with an insertion/removal handle (18>).

In particular, as shown in FIG. 4(0), among the pair of connection members (20a) and (20b) of the quick coupling that are connected to each other, the one (20a) having a shutoff valve is inserted through the plug part (21). The plug part (21) has a threaded part that is screwed into the inner plug mounting thread part of the valve tee (3), and the bypass pipe connectors (10) and (13) are installed in place of the inner plug (3c). The other connecting member (20b), which was previously provided on the valve tee (3) and attached to the bypass pipes (8) and (14), is connected to the bypass pipe connector (10), <1
By simply inserting or pulling out the bypass pipe (8)
) and (14) can be connected and removed, it is convenient because the gas leak prevention jigs (11) and (12) can be omitted.

In the first invention, the construction procedure can be changed appropriately, for example, the procedure changes in the following items (a) to (f) can be made.

(a) Simultaneously with the excavation of Barbuchi (3), or
Before the excavation, a repair closure (7) to which the bypass pipe (8) is connected may be attached to the meter cock body (5a).

(b) The bypass pipe (8) may be connected to the repair closure (7) before it is attached to the meter cock body (5a).

(c) Air purging of the bypass pipe (8) and connection of the bypass pipe to the bypass pipe connector (10) may be performed first, but if the former is done first, the bypass pipe connector (
10) to the valve tee (3) in a state that allows city gas to be supplied to the supply pipe (1), then connect the bypass pipe (8)
) may be connected to the bypass pipe fitting (10).

(d) Various types of valves can be used to switch between blocking and allowing gas flow in the bypass pipe (8). Also, the bypass pipe (8) is preferably a hose, but
A rigid pipe may also be used.

(E) When restarting the supply of city gas to the supply pipe (1), the bypass pipe connector (10) may be pulled out and the repair closure (7) may be rotated either first or at the same time.

(to) Barbecue (3) restoration work and meter cock (5)
) restoration work may be carried out either first or at the same time.

In the second invention, the construction procedure can be changed appropriately, for example, the procedure changes in the following items (a) to (f) can be made.

(a) The bypass pipe (14) may be connected to the bypass pipe connector (13) before attachment to the chi main body (3a).

(CI) Either air purge of the bypass pipe (14) or connection of the bypass pipe to the repair closure (16) may be done first, but if the former is done first, the repair closure (16)
) to the meter cock (5) in a state that allows city gas to be supplied to the supply pipe (1), then connect the bypass pipe (14
) may be connected to the repair closure (16).

(c) Various types of valves can be used to switch between blocking and allowing gas flow in the bypass pipe (14). Further, the bypass pipe (14) is preferably a hose, but may also be a hard pipe.

(d) When restarting the supply of city gas to the supply pipe (1), the bypass pipe connector (13) may be pulled out and the repair closure (16) may be rotated either first or at the same time.

(E) Restoration work of Barbecue (3) and meter cock (5)
) restoration work may be carried out either first or at the same time.

The type of repair of the supply pipe (1) is not limited, and includes, for example, leak repair, inner and outer lining treatment, inner surface cleaning, and replacement of pipes and joints.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

FIGS. 1(A) to 1(D) are construction conceptual diagrams showing a first embodiment of the present invention. Figure 2 ((), (0) is an explanatory diagram of a repair closure used in the present invention. Figure 3 (A), (0) is a construction conceptual diagram showing a second embodiment of the present invention. Fig. 4 ((), (l) are conceptual diagrams showing different embodiments of the bypass pipe connector used in the present invention. Fig. 5 is a conceptual diagram of a conventional example. (1)... ... Supply pipe, (2) ... Main pipe or branch pipe, (3) ... Bubble pipe, (3a) ...
...Chi body, (3b), (3c)...
Plug, (5)...Meter cock, (5a)・
...Cook body, (5b) ... Closure, (
5c)...Meter cock entrance, (5d)...
...Meter cock outlet, (6)...Gas leak prevention jig, (7)...Repair closure, (7a)
...Internal flow path, (8) ...Bypass pipe, (10) ...Bypass pipe connector, (11).
...Jig for preventing gas leakage, (12)...
Gas leak prevention jig, (13)...Bypass pipe connector, (14)...Bypass pipe, (16).
...Repair closure, (16a)...Internal flow path, (F)...Gas leak prevention jig, (20
a), (20b)... Connection member, (21).
...Plug section.

Claims (1)

[Claims] 1. A method for repairing a supply pipe of a city gas pipe, which repairs the supply pipe (1) between a valve tee (3) and a meter cock (5) on the main pipe or branch pipe (2) side. , Attach a gas leak prevention jig (6) to the meter cock (5), and with the jig (6) preventing gas leakage, insert the closing member (5b) of the meter cock (5) into the cock body. After removing it from (5a), fit the repair closure (7) to the cock body (5a), and connect the meter cock inlet (5c) with the internal flow path (7a) of the repair closure (7). The bypass pipe (8) connected to the internal flow path (7a) of the repair closure (7) is air-purged with city gas from the supply pipe (1). A gas leak prevention jig (11) is attached to the valve cheek (3), and with the jig (11) preventing gas leakage, the valve cheek (3) is connected to the bypass pipe connector (10). plugs (3b), (3c
) from the chi body (3a), then remove the chi body (
3a), and at the same time the city gas supply to the supply pipe (1) is cut off by the action of the bypass pipe connector (10), the bypass pipe (8) is connected to the bypass pipe (8).
supplies city gas to the meter cock outlet (5d), and cuts off the city gas supply from the bypass pipe (8) to the meter cock inlet (5c) by rotating the repair closure (7); While continuing to supply city gas to the consumer through the pipe (8), the supply pipe (1) is repaired and reconnected, and after the repair, the bypass pipe is closed by rotating the repair closure (7). City gas is supplied from the supply pipe (1) from (8).
), pull out the bypass pipe connector (10), and open the cock inlet (5) by rotating the repair closure (7).
c), connect the cock outlet (5d) and the bypass pipe (8), supply city gas to the supply pipe (1), close the bypass pipe (8), and install the gas leak prevention jig ( 11), the bypass pipe connector (10) is removed from the tee body (3a), and the plugs (3b) and (3c) are inserted into the tee body (3a).
3a), collect the gas leak prevention jig (11) from the valve tee (3), and with the gas leak prevention jig (6) preventing gas leakage, replace the repair closure ( 7) to the cock body (5)
a), and attach the closure (5b) to the cock body (5a) in an open state, and then remove the gas leakage prevention jig (
6) from the meter cock (5). 2. A method for repairing the supply pipe of a city gas pipeline, in which the supply pipe (1) is repaired between the valve pipe (3) on the main pipe or branch pipe (2) side and the meter cock (5), wherein the valve pipe (3) A gas leak prevention jig (12) is attached to the gas leakage prevention jig (12), and with the jig (12) preventing gas leakage, plugs (3b) and (3c) of the valve tee (3) are installed.
) from the chi body (3a), then remove the chi body (
Fit the bypass pipe connector (13) into the bypass pipe connector (13) and connect the plug hole of the tee body (3a) to the bypass pipe connector (3a).
13) and connected to the bypass pipe connector (13), the bypass pipe (14) is air-purged with city gas from the valve chi (3), and the repair closure (16) is closed.
Connect the gas leak prevention jig (17) to the meter cock (5).
After installing the meter cock (5) and removing the closure (5b) of the meter cock (5) from the cock body (5a) while preventing gas leakage with its jig (17), remove the meter cock (5) from the cock body (5a).
), and the internal flow path (16a) of the repair closure (16) connects the bypass pipe (14), the meter cock inlet (5c), and the meter cock outlet ( 5d), and the bypass pipe connector (13) is connected to the chi main body (3a).
At the same time, the city gas supply to the supply pipe (1) is cut off by the action of the bypass pipe connector (13), and at the same time, the bypass pipe (14) is connected to the meter cock outlet (5d).
), cut off the city gas supply from the bypass pipe (14) to the meter cock inlet (5c) by rotating the repair closure (16), and supply the city gas to the meter cock inlet (5c) through the bypass pipe (14). The supply pipe (1) is repaired and reconnected while continuing the supply of city gas to the bypass pipe (14). After the repair, the city gas is supplied from the bypass pipe (14) by rotating the repair closure (16) Air purges the supply pipe (1) during supply, pulls out the bypass pipe connector (13), and closes the cock inlet (1) by rotating the repair closure (16).
5c), the cock outlet (5d), and the bypass pipe (14) are connected to supply city gas to the supply pipe (1), the bypass pipe (14) is closed, and the gas leak prevention jig ( 12), remove the bypass pipe connector (13) from the chi body (3a), attach the plugs (3b) and (3c) to the chi body (3a), and Recover the gas leak prevention jig (12) from the valve tee (3), and with the gas leak prevention jig (17) blocking gas leak, insert the repair closure (16) into the cock body. (5a), and attach the closure (5b) to the cock body (5a) in an open state to collect the gas leak prevention jig (17) from the meter cock (5) of the city gas pipe. Supply pipe repair method. 3. A bypass pipe connector used in the construction method according to claim 1 or 2, which includes a shutoff valve among the pair of connecting members (20a) and (20b) of the quick joint that connect to each other. (20a) is attached to a plug part (21) having a threaded part that can be freely screwed into the inner plug mounting threaded part of a valve tee (3) in a penetrating state.